Fan blade for flywheels of sewing machines



March 30, 1943. R WE|DNER ETAL 2,315,235

FAN BLADES FOR FLYWHEELS OF SEWING MACHINES Filed July 15, 1941 Patented Mar. 30, 1943 FAN BLADE FOR FLYWHEELS OF SEWING MACHINES Rupert Weidner and Jacob D. Yaro,

New York, N. Y.

Application July 15, 1941, Serial No. 402,554

6 Claims. (Cl. 230-248) This invention relates to new and useful improvements in fan blades for the flywheel of a sewing machine.

The invention proposes a fan attachment for the flywheel 01' a sewing machinewhich is characterized by an annular rubber casing for enga ing on the flywheel and having a plurality of radially projecting fan blades. It is proposed that the fan attachment be constructed for clockwise or counter-clockwise rotation, to fit on a flywheel of a sewing machine.

The advantage of the fan attachment resides in the fact that it will produce a current of air to cool the-operator of the machine. More specifically, it is proposed that the annular rubber casing be in the nature of a small rubber body simulating an automobile tire which may be forced open and engaged over the flywheel of a sewing machine and allowed to close down on the flywheel so as to maintain its position due to its inherent resiliency. It is proposed that this annular rubber casing be provided with at least three fan blades equally spaced from each other and capable of throwing the air in the direction of the operator of the sewing machine.

Still further the invention contemplates vari ous modified constructions which include an arrangement in which the fan blades are made of rubber material separate from the material of the annular casing, but firmly held in position by overlapping edge portions of these parts.

The invention also contemplates an arrangement whereby the fan blades may be adjusted to control the direction in which the current of air is thrown.

For further comprehension of the invention, and of the objects and advantages thereof, reference will :be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is an elevational view of the flywheel of a sewing machine provided with fan blades constructed in accordance with this invention.

Fig. 2 is an end elevational view looking from the right hand end of Fig. 1. I

Fig 3 is a vertical sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is a fragmentary enlarged vertical sectional view taken on the line 4-4 ofFig. 1.

Fig. 5 is a fragmentary sectional view similar to Fig. 3 but illustrating a modified construction.

Fig. 6 is a horizontal sectional view taken on the line 6-8 of Fig. 5.

Fig. 7 is a fragmentary sectional view similar to gig. 5 but illustrating another modified construc- Fig. 8 is a fragmentary sectional view taken on the line 88 of Fig. '7.

The fan blades :for the fly-wheels of sewing machines, in accordance with this invention, include an annular rubber casing Ill for engaging on the flywheel I I of a sewing machine. This casing is provided with a plurality of radially projecting integral fan-blades I 2, which are moulded or otherwise formed in one piece, of any suitable material, such as rubber composition, compressed fabric, etc. The casing I0 is substantially of semi-circular shape in transverse cross section. The fan blades I2 are equally spaced from each other but may also be unequally spaced. These blades have one of their edges l2 set in from one side Ill of the rubber casing in so that this side is free and. may be flexed open to disengage the casing from the flywheel or to engage it in position. The other sides I2 of the blades I2 extend down along the outer sides of the casing III, as clearly shown in the drawing. The blades I2 are set at a desired angle so as to be capable of throwing a current of air towards the operator of the sewing machine. These blades are curved transversely to strengthen thetsame against bending and are preferably made wider at the bottom.

In Fig. 3 a hand flywheel I l which is proposed to rotate in a clockwise directionis disclosed. It is proposed that thefan attachment be capable of being applied also to a hand flywheel of a sewing machine rotating in'a counter-clockwise direction. The only change necessary would be in the angle of the blades I 2. They must be turned in a direction opposite to that shown on the drawme.

In Figs. 5 and 6 a modified form of the invention has been disclosed which distinguishes from the prior form essentially in the fact that the fan attachment comprises an annular tubular casing I6 for engaging on the flywheel I I of a sewing machine and having several apertures I1 equally spaced from each other around the circumference of the casing. Several fan blades I8 have base portions I9 extending through the apertures ll. These base portions I9 have flange portions 20 engaging beneath the edge portions of the apertures I1.

The fan blades I8 may be mounted upon the rubber casing l6 by engaging them through the openings ll from the inner side of the casing.

When the casing-is mounted on the flywheel ll the resiliency oi the casing serves to hold the fan blades in position. The base portions ll oi. the fan blades are shown formed with flat sides I! opposed to each other and curved ends II I construction is capable of flrmly holding the blades is in position.

In Figs. 7 and 8another modifled form of the invention has been disclosed which is very similar to the forms shown in Figs. 5 and 6, distin- I guishing merely in the fact that the base portions II and the apertures l1 and the flange portions 2. of the blades ii are circular. With this arrangement it is possible to turn the blades ll to selected positions so as to better control the discharge of a current otair towards the operation of the sewing machine. In other respects this form of the invention is similar. to the previous forms. v

It is to be understood that the fan blades and the annular casing may be of rubber, compressed fabric, or of any other suitable, pliable or semisoft material.

It is also to be understood that the casing l0 may be attached either directly on the flywheel of a sewing machine or on an extension flywheel which may be made to protrude from the driveshait or from any other rotating part oi the sewingmachine. I

The casing II may be either one piece or may be made of a number of small sections andattached to the flywheel by a suitable mechanical arrangement.

while we have illustrated and described the preferred embodiments of our invention, it is.

to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes and modiiications coming within the scope of the invention as deflned'in the appended claims.

. Having thus described our invention, what we claim as new, and desire to secure by United 7 States Letters Patent is:

1. A fan blade attachment for the flywheel of a a sewing machine having an annular rubber casing and a plurality of rubber fan blades proiecting radially from said casing, each of said fan blades, comprising a fan blade portion, and a disc-like base portion'integrally formed on the bottom end of said fan bladeportion and said rubber casing being formed with spacedcircular openings through which each of said blade portions is projected to extend radially of said flywheel. I

2. A fan blade attachment for the flywheelof a sewing machine having an annular rubber than said openings so as to have the edge portions clamped between the adjacentraces 0! said flywheel and the material of said casing surrounding said openings to irictionally retain said fan blades in various turned positions relative to said casing.

3. A fan blade attachmentior the flywheel or a sewing machine having an annular rubber casing and a plurality of rubber fan blades pro- Jecting radially from said casing, each of said fan blades, comprising a fan blade portion, and a disc-like base portion integrally formed on the bottom end of said ian blade portion and said rubber casing being formed with spaced circular openings through which each of said blade portions is projected to extend radially of said flywheel, said base portions being ot a size greater than said openings so as to have the edge portions clamped between the adjacent faces of said flywheel and the material of said casing surrounding said openings to frictionally retain said fan blades in various turned positions relative to said casing, said casing being capable of being lifted away from said flywheel to tree said fan blades to be turned relative to said casing to vary their angular positioning with relation to said casing.

4. A fan blade attachment for the flywheel of a sewing machine having an annular rubber casing and plurality oi rubber fan blades projecting radially from said casing, each of said fan blades-comprising a fan blade portion, and a disc-like base portion integrally formed on the bottom end of said fan blade portion and said rubber. casing being formed with spaced circular openings through which each oi said blade portions is projected to extend radially of said flywheel, said fan blade portions being arcuate in cross-section and the cord between the ends oi said arc at the junction of said blade portions and base portions being substantially equal to the diameter of the openings in said casing causing the edge portions of said blade portions to engage the edge portions of said casing around said openings and maintain said base portions concentrically aligned with said openings.

5. A fan blade attachment for the flywheel oi a sewing machine having an annular rubber caslngand a plurality of rubber fan blades pro- Jecting radially from said casing, each oil said fan blades, comprising a fan blade portion, and

. a base portion integrally formed on the bottom casingand a' plurality ofrubber fan blades projecting radially from said casing, each of said fan blades, comprising a fan blade portion, and a disc-like base portion integrally formed on the bottom end of said 'ian blade portion and said rubber casing being formed with spaced circular openings through'which each of said blade portions is projected to extend radially "of said fly--v wheel, said base portions beingoi a size greater end of said fan blade portion and said rubber casing being formed with spaced openings through which each of said blade portions is projected to extend radially of said flywheel. 6. A fan blade attachment for the flywheel of a sewing machine having an annular rubber casing and a plurality of rubber fan blades projecting radially from said casing, each of said fan blades, comprising a fan blade portion, and a non-circular base portion integrally formed on the bottom end of said fan blade portion and said rubber casing being formed with spaced non-circular openings through which each of said blade portions is projected to extend radially of said flywheel.

' RUPERT WEIDNER.

JACOB D. YARO. 

